/* The IGEN simulator generator for GDB, the GNU Debugger.
Copyright 2002-2020 Free Software Foundation, Inc.
Contributed by Andrew Cagney.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* load the opcode stat structure */
#include "misc.h"
#include "lf.h"
#include "table.h"
#include "filter.h"
#include "igen.h"
#include "ld-decode.h"
#ifndef NULL
#define NULL 0
#endif
static const name_map decode_type_map[] = {
{"normal", normal_decode_rule},
{"boolean", boolean_rule},
{NULL, normal_decode_rule},
};
static const name_map decode_gen_map[] = {
{"array", array_gen},
{"switch", switch_gen},
{"padded-switch", padded_switch_gen},
{"goto-switch", goto_switch_gen},
{NULL, -1},
};
static const name_map decode_reserved_map[] = {
{"zero-reserved", 1},
{NULL, 0},
};
static const name_map decode_duplicates_map[] = {
{"duplicate", 1},
{NULL, 0},
};
static const name_map decode_combine_map[] = {
{"combine", 1},
{NULL, 0},
};
static const name_map decode_search_map[] = {
{"constants", decode_find_constants},
{"mixed", decode_find_mixed},
{"strings", decode_find_strings},
{NULL, decode_find_mixed},
};
static void
set_bits (int bit[max_insn_bit_size], unsigned64 value)
{
int bit_nr;
for (bit_nr = 0; bit_nr < max_insn_bit_size; bit_nr++)
{
if (bit_nr < options.insn_bit_size)
bit[bit_nr] = (value >> (options.insn_bit_size - bit_nr - 1)) & 1;
else
bit[bit_nr] = 0;
}
}
decode_table *
load_decode_table (char *file_name)
{
table *file = table_open (file_name);
table_entry *entry;
decode_table *table = NULL;
decode_table **curr_rule = &table;
while ((entry = table_read (file)) != NULL)
{
char *decode_options = entry->field[decode_options_field];
decode_table *new_rule = ZALLOC (decode_table);
if (entry->nr_fields < min_nr_decode_fields)
error (entry->line, "Missing decode table fields\n");
new_rule->line = entry->line;
/* the options field */
new_rule->type = name2i (decode_options, decode_type_map);
if (options.decode.overriding_gen != NULL)
new_rule->gen =
name2i (options.decode.overriding_gen, decode_gen_map);
else
new_rule->gen = name2i (decode_options, decode_gen_map);
if (new_rule->gen == padded_switch_gen && options.decode.switch_as_goto)
new_rule->gen = goto_switch_gen;
if (options.decode.zero_reserved)
new_rule->with_zero_reserved = 1;
else
new_rule->with_zero_reserved =
name2i (decode_options, decode_reserved_map);
if (options.decode.duplicate)
new_rule->with_duplicates = 1;
else
new_rule->with_duplicates =
name2i (decode_options, decode_duplicates_map);
if (options.decode.combine)
new_rule->with_combine = 1;
else
new_rule->with_combine = name2i (decode_options, decode_combine_map);
if (new_rule->type == boolean_rule)
{
char *chp = decode_options;
while (*chp != '\0')
{
if (isdigit (*chp))
{
new_rule->constant = a2i (chp);
break;
}
chp = skip_to_separator (chp, ",");
chp = skip_spaces (chp);
}
}
/* First and last */
if (entry->nr_fields > decode_first_field
&& strlen (entry->field[decode_first_field]) > 0)
{
new_rule->first = target_a2i (options.hi_bit_nr,
entry->field[decode_first_field]);
if (new_rule->first < 0 || new_rule->first >= options.insn_bit_size)
error (new_rule->line, "First field out of range\n");
}
else
new_rule->first = 0;
if (entry->nr_fields > decode_last_field
&& strlen (entry->field[decode_last_field]) > 0)
{
new_rule->last = target_a2i (options.hi_bit_nr,
entry->field[decode_last_field]);
if (new_rule->last < 0 || new_rule->last >= options.insn_bit_size)
error (new_rule->line, "Last field out of range\n");
}
else
new_rule->last = options.insn_bit_size - 1;
if (new_rule->first > new_rule->last)
error (new_rule->line, "First must preceed last\n");
/* force first/last, with default values based on first/last */
if (entry->nr_fields > decode_force_first_field
&& strlen (entry->field[decode_force_first_field]) > 0)
{
new_rule->force_first = target_a2i (options.hi_bit_nr,
entry->
field
[decode_force_first_field]);
if (new_rule->force_first < new_rule->first
|| new_rule->force_first > new_rule->last + 1)
error (new_rule->line, "Force first out of range\n");
}
else
new_rule->force_first = new_rule->last + 1;
if (entry->nr_fields > decode_force_last_field
&& strlen (entry->field[decode_force_last_field]) > 0)
{
new_rule->force_last = target_a2i (options.hi_bit_nr,
entry->
field[decode_force_last_field]);
if (new_rule->force_last > new_rule->last
|| new_rule->force_last < new_rule->first - 1)
error (new_rule->line, "Force-last out of range\n");
}
else
new_rule->force_last = new_rule->first - 1;
/* fields to be treated as constant */
if (entry->nr_fields > decode_constant_field_names_field)
filter_parse (&new_rule->constant_field_names,
entry->field[decode_constant_field_names_field]);
/* applicable word nr */
if (entry->nr_fields > decode_word_nr_field)
new_rule->word_nr = a2i (entry->field[decode_word_nr_field]);
/* required instruction format names */
if (entry->nr_fields > decode_format_names_field)
filter_parse (&new_rule->format_names,
entry->field[decode_format_names_field]);
/* required processor models */
if (entry->nr_fields > decode_model_names_field)
filter_parse (&new_rule->model_names,
entry->field[decode_model_names_field]);
/* required paths */
if (entry->nr_fields > decode_paths_field
&& strlen (entry->field[decode_paths_field]) > 0)
{
decode_path_list **last = &new_rule->paths;
char *chp = entry->field[decode_paths_field];
do
{
(*last) = ZALLOC (decode_path_list);
/* extra root/zero entry */
(*last)->path = ZALLOC (decode_path);
do
{
decode_path *entry = ZALLOC (decode_path);
entry->opcode_nr = a2i (chp);
entry->parent = (*last)->path;
(*last)->path = entry;
chp = skip_digits (chp);
chp = skip_spaces (chp);
}
while (*chp == '.');
last = &(*last)->next;
}
while (*chp == ',');
if (*chp != '\0')
error (entry->line, "Invalid path field\n");
}
/* collect up the list of optional special conditions applicable
to the rule */
{
int field_nr = nr_decode_fields;
while (entry->nr_fields > field_nr)
{
decode_cond *cond = ZALLOC (decode_cond);
decode_cond **last;
if (entry->nr_fields > field_nr + decode_cond_mask_field)
set_bits (cond->mask,
a2i (entry->
field[field_nr + decode_cond_mask_field]));
if (entry->nr_fields > field_nr + decode_cond_value_field)
{
if (entry->field[field_nr + decode_cond_value_field][0] ==
'!')
{
cond->is_equal = 0;
set_bits (cond->value,
a2i (entry->
field[field_nr + decode_cond_value_field] +
1));
}
else
{
cond->is_equal = 1;
set_bits (cond->value,
a2i (entry->
field[field_nr +
decode_cond_value_field]));
}
}
if (entry->nr_fields > field_nr + decode_cond_word_nr_field)
cond->word_nr =
a2i (entry->field[field_nr + decode_cond_word_nr_field]);
field_nr += nr_decode_cond_fields;
/* insert it */
last = &new_rule->conditions;
while (*last != NULL)
last = &(*last)->next;
*last = cond;
}
}
*curr_rule = new_rule;
curr_rule = &new_rule->next;
}
return table;
}
int
decode_table_max_word_nr (decode_table *entry)
{
int max_word_nr = 0;
while (entry != NULL)
{
decode_cond *cond;
if (entry->word_nr > max_word_nr)
max_word_nr = entry->word_nr;
for (cond = entry->conditions; cond != NULL; cond = cond->next)
{
if (cond->word_nr > max_word_nr)
max_word_nr = cond->word_nr;
}
entry = entry->next;
}
return max_word_nr;
}
static void
dump_decode_cond (lf *file, char *prefix, decode_cond *cond, char *suffix)
{
lf_printf (file, "%s(decode_cond *) 0x%lx", prefix, (long) cond);
if (cond != NULL)
{
lf_indent (file, +1);
lf_printf (file, "\n(word_nr %d)", cond->word_nr);
lf_printf (file, "\n(mask 0x%lx)", (long) cond->mask);
lf_printf (file, "\n(value 0x%lx)", (long) cond->value);
lf_printf (file, "\n(is_equal 0x%lx)", (long) cond->is_equal);
lf_printf (file, "\n(next (decode_cond *) 0%lx)", (long) cond->next);
lf_indent (file, -1);
}
lf_printf (file, "%s", suffix);
}
static void
dump_decode_conds (lf *file, char *prefix, decode_cond *cond, char *suffix)
{
lf_printf (file, "%s(decode_cond *) 0x%lx", prefix, (long) cond);
while (cond != NULL)
{
dump_decode_cond (file, "\n(", cond, ")");
cond = cond->next;
}
lf_printf (file, "%s", suffix);
}
void
dump_decode_rule (lf *file, char *prefix, decode_table *rule, char *suffix)
{
lf_printf (file, "%s(decode_table *) 0x%lx", prefix, (long) rule);
if (rule != NULL)
{
lf_indent (file, +1);
dump_line_ref (file, "\n(line ", rule->line, ")");
lf_printf (file, "\n(type %s)", i2name (rule->type, decode_type_map));
lf_printf (file, "\n(gen %s)", i2name (rule->gen, decode_gen_map));
lf_printf (file, "\n(first %d)", rule->first);
lf_printf (file, "\n(last %d)", rule->last);
lf_printf (file, "\n(force_first %d)", rule->force_first);
lf_printf (file, "\n(force_last %d)", rule->force_last);
dump_filter (file, "\n(constant_field_names \"",
rule->constant_field_names, "\")");
lf_printf (file, "\n(constant 0x%x)", rule->constant);
lf_printf (file, "\n(word_nr %d)", rule->word_nr);
lf_printf (file, "\n(with_zero_reserved %d)", rule->with_zero_reserved);
lf_printf (file, "\n(with_duplicates %d)", rule->with_duplicates);
lf_printf (file, "\n(with_combine %d)", rule->with_combine);
dump_filter (file, "\n(format_names \"", rule->format_names, "\")");
dump_filter (file, "\n(model_names \"", rule->model_names, "\")");
dump_decode_conds (file, "\n(conditions ", rule->conditions, ")");
lf_printf (file, "\n(next 0x%lx)", (long) rule->next);
lf_indent (file, -1);
}
lf_printf (file, "%s", suffix);
}
#ifdef MAIN
static void
dump_decode_rules (lf *file, char *prefix, decode_table *rule, char *suffix)
{
lf_printf (file, "%s", prefix);
while (rule != NULL)
{
lf_indent (file, +1);
dump_decode_rule (file, "\n(", rule, ")");
lf_indent (file, -1);
rule = rule->next;
}
lf_printf (file, "%s", suffix);
}
igen_options options;
int
main (int argc, char **argv)
{
lf *l;
decode_table *rules;
INIT_OPTIONS (options);
if (argc != 3)
error (NULL, "Usage: decode <decode-file> <hi-bit-nr>\n");
options.hi_bit_nr = a2i (argv[2]);
rules = load_decode_table (argv[1]);
l = lf_open ("-", "stdout", lf_omit_references, lf_is_text, "tmp-ld-insn");
dump_decode_rules (l, "(rules ", rules, ")\n");
return 0;
}
#endif